[Idr] Benoit Claise's Discuss on draft-ietf-idr-large-community-11: (with DISCUSS and COMMENT)

"Benoit Claise" <bclaise@cisco.com> Wed, 04 January 2017 14:52 UTC

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Subject: [Idr] Benoit Claise's Discuss on draft-ietf-idr-large-community-11: (with DISCUSS and COMMENT)
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Benoit Claise has entered the following ballot position for
draft-ietf-idr-large-community-11: Discuss

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DISCUSS:
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I see from the abstract: "The attribute is suitable for use with
four-octet ASNs."
I also see this text, which doesn't mention four-octet ASNs

   The Global Administrator field is intended to allow different
   Autonomous Systems to define BGP Large Communities without
collision.
   This field SHOULD be an Autonomous System Number (ASN), in which
case
   the Local Data Parts are to be interpreted as defined by the owner
of
   the ASN.  The use of Reserved ASNs (0 [RFC7607], 65535 and
4294967295
   [RFC7300]) is NOT RECOMMENDED.

What if the ASN is two bytes, we use padding? How?
Even if we would say: "This field SHOULD be an four-octet Autonomous
System Number (ASN)", it doesn't preclude inserting a two-octet ASN in
the Global Administrator field.
Isn't it better to specify how? 

>From RFC 6793:

   Currently assigned two-octet AS numbers are converted into
four-octet
   AS numbers by setting the two high-order octets of the four-octet
   field to zero.  Such a four-octet AS number is said to be mappable
to
   a two-octet AS number.


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COMMENT:
----------------------------------------------------------------------

Thanks John for an excellent shepherd writeup.